Search Publications
Cosmic protons
Usoskin, I.; Laitinen, T.; Valtonen, E. +200 more
The primary proton spectrum in the kinetic energy range 0.2 to 200 GeV was measured by the Alpha Magnetic Spectrometer (AMS) during space shuttle flight STS-91 at an altitude of 380 km. The complete data set combining three shuttle attitudes and including all known systematic effects is presented.
Leptons in near earth orbit
Usoskin, I.; Laitinen, T.; Valtonen, E. +199 more
The lepton spectra in the kinetic energy ranges 0.2 to 40 GeV for e- and 0.2 to 3 GeV for e+ were measured by the Alpha Magnetic Spectrometer (AMS) during space shuttle flight STS-91 at altitudes near 380km. >From the origin of the leptons two distinct spectra were observed: a higher energy spectrum and a substantial secon…
Protons in near earth orbit
Finelli, F.; Santos, D.; Usoskin, I. +212 more
The proton spectrum in the kinetic energy range 0.1 to 200 GeV was measured by the Alpha Magnetic Spectrometer (AMS) during space shuttle flight STS-91 at an altitude of 380km. Above the geomagnetic cutoff the observed spectrum is parameterized by a power law. Below the geomagnetic cutoff a substantial second spectrum was observed concentrated at …
Helium in near Earth orbit
Usoskin, I.; Laitinen, T.; Valtonen, E. +201 more
The helium spectrum from 0.1 to /100 GeV/nucleon was measured by the Alpha Magnetic Spectrometer (AMS) during space shuttle flight STS-91 at altitudes near 380 km. Above the geomagnetic cutoff the spectrum is parameterized by a power law. Below the geomagnetic cutoff a second helium spectrum was observed. In the second helium spectra over the ener…
Search for antihelium in cosmic rays.
Finelli, F.; Santos, D.; Usoskin, I. +207 more
The alpha magnetic spectrometer (AMS) was flown on the space shuttle Discovery during flight STS-91 in a 51.7° orbit at altitudes between 320 and 390 km. A total of 2.86×106 helium nuclei were observed in the rigidity range 1 to 140 GV. No antihelium nuclei were detected at any rigidity. An upper limit on the flux ratio of antihelium to…
How uncertain are solar neutrino predictions?
Basu, Sarbani; Pinsonneault, M. H.; Bahcall, John N.
Solar neutrino fluxes and sound speeds are calculated using a systematic reevaluation of nuclear fusion rates. The largest uncertainties are identified and their effects on the solar neutrino fluxes are estimated.